4K3C

The crystal structure of BamA from Haemophilus ducreyi lacking POTRA domains 1-3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural insight into the biogenesis of beta-barrel membrane proteins.

Noinaj, N.Kuszak, A.J.Gumbart, J.C.Lukacik, P.Chang, H.Easley, N.C.Lithgow, T.Buchanan, S.K.

(2013) Nature 501: 385-390

  • DOI: 10.1038/nature12521
  • Primary Citation of Related Structures:  
    4K3B, 4K3C

  • PubMed Abstract: 
  • β-barrel membrane proteins are essential for nutrient import, signalling, motility and survival. In Gram-negative bacteria, the β-barrel assembly machinery (BAM) complex is responsible for the biogenesis of β-barrel membrane proteins, with homologous ...

    β-barrel membrane proteins are essential for nutrient import, signalling, motility and survival. In Gram-negative bacteria, the β-barrel assembly machinery (BAM) complex is responsible for the biogenesis of β-barrel membrane proteins, with homologous complexes found in mitochondria and chloroplasts. Here we describe the structure of BamA, the central and essential component of the BAM complex, from two species of bacteria: Neisseria gonorrhoeae and Haemophilus ducreyi. BamA consists of a large periplasmic domain attached to a 16-strand transmembrane β-barrel domain. Three structural features shed light on the mechanism by which BamA catalyses β-barrel assembly. First, the interior cavity is accessible in one BamA structure and conformationally closed in the other. Second, an exterior rim of the β-barrel has a distinctly narrowed hydrophobic surface, locally destabilizing the outer membrane. And third, the β-barrel can undergo lateral opening, suggesting a route from the interior cavity in BamA into the outer membrane.


    Organizational Affiliation

    National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane protein assembly factor BamAA532[Haemophilus] ducreyiMutation(s): 0 
Gene Names: D15bamA
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Omp85-TpsB Outer Membrane Transporter Superfamily
Protein: 
BamA with POTRA domains 4 & 5
Find proteins for Q93PM2 (Haemophilus ducreyi)
Explore Q93PM2 
Go to UniProtKB:  Q93PM2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.224 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.779α = 90
b = 88.162β = 90
c = 244.454γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
PHENIX/AutoSOLmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIX/AutoSOLphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-09-11
    Changes: Database references
  • Version 1.2: 2013-10-02
    Changes: Database references